Jump to content
SAU Community

Recommended Posts

And whats the difference from BHP to just normal HP.

BHP refers to an engines power with nothing else dragging it down (no mufflers/gearbox/diff/aux components etc). So in reality it is the power the engine makes before it is put into the car hooked up onto an engine dyno in a workshop.

HP is just the overall unit of measurement and can refer to anything eg. HP @ the wheels.

Lets say your car makes 330kw at all wheels whats that in BHP & HP.

330kw@wheels is around 442hp@wheels.

To convert that to BHP is more of a guessing game and gets brought up on the forums quite a lot. Most methods people say are completely wrong (percentage, fixed amount etc). The only way to truely convert it is to know the BHP of the engine, then to know the HP@wheels of that exact same engine. Work out the loss of power and use that as your "x". Then when you have more power, so in your case 442hp@wheels, add the "x" and this will be your rough lowest amount of BHP. It will naturally be a bit more than this as there will be more loss, but this can't be worked out accurately enough for the sake of these discussions. There are a lot of factors that come into play and it gets quite technical.

So just quickly as an example (I have done this one a few times in the past).

Car makes 400BHP when new.

Same car put onto a dyno makes 350HP@wheels.

Loss of 50HP.

Three years later the car has been modified with an exhaust, tune and more boost and now makes 500HP@wheels.

Add back original loss of 50HP.

The rough lowest amount of BHP is 550BHP.

However in reality it will obviously be slightly more than this as more loss has occured.

When a car is advertised brand new do they ever tell you the AWKW or is it engine KW?

Only ever BHP.

Hope that clears all that up for you.

Only ever BHP.

Hope that clears all that up for you.

Execpt sometimes those figures a kinda fudged lol.

eg the new supercharged V8 falcons, are rated at 335kws at the flywheel, but they reel off 340rwkws dead standard lol

so it would make 335kws somewhere in the rev range.

Yeah they bullshit the figures sometimes. But they are ment to be rated as BHP.

Really? They make that much at the wheels standard? Wow.

Yeah...it does make sense though, I mean the standard NA 5L makes 307kw, then they strap an Harrop HTV1900 blower on it an only make a few killerwasps more...yeah right lol

They are bloody pathetic at getting that power to the ground then !!! Obviously need some 19 x 10 on the back and 275/35/19s.

Btw each car is different. I use [(Engine Kw)-15]x 0.85 = rwkw..................

...............but then again...I'm a d!ckhead. :3some:

Edited by simpletool

They are bloody pathetic at getting that power to the ground then !!! Obviously need some 19 x 10 on the back and 275/35/19s.

Btw each car is different. I use [(Engine Kw)-15]x 0.85 = rwkw..................

...............but then again...I'm a d!ckhead. :3some:

its easier to just do HP x 0.746 (or 0.75) = KW

or the other way KW x 1.36 = HP

Execpt sometimes those figures a kinda fudged lol.

eg the new supercharged V8 falcons, are rated at 335kws at the flywheel, but they reel off 340rwkws dead standard lol

so it would make 335kws somewhere in the rev range.

Are you sure 340rwkw dead standard?? I read about one that had the boost turned up and tuned making that power.

I know they are bloody impressive but I dont think 340rwkw dead standard.

Are you sure 340rwkw dead standard?? I read about one that had the boost turned up and tuned making that power.

I know they are bloody impressive but I dont think 340rwkw dead standard.

seen a few dyno runs now...one even ran 353rwkws but is a rather happy dyno

with a tune, good exhasut and WMI they will do 400rwkws.

Cant wait for the intercooled ones, so they can throw some real boost into them

so even if we say they are all happy dynos, how many are happy by even 40kws?

edit - they run 114mph through the traps on street tyres, they weigh 1820kgs + driver

seen a few dyno runs now...one even ran 353rwkws but is a rather happy dynowith a tune, good exhasut and WMI they will do 400rwkws.Cant wait for the intercooled ones, so they can throw some real boost into them

Gearbox says no.

353rwkw so around 430kw at the engine. That's 240kw/tonne or 116 mph trap speed (minimum).

I don't think they make that power stock the gs rated 315 from factory pulls about 260rwkw then after tune without any other modifications 380rwkw. I'd say gt would be about 280rwkw at most.

Take note that once tuned the gs/gt are identical power.

exhaust, pulley, water injection

Has anyone seen what the dyno readout looks like after 2-3 runs though?<br>Massive heatsoak in the 'heat diffuser', then the PCM shuts down the maximum<div>throttle position to around 30%.....<br>One good run down the track, then an hour and a half waiting for the <br>temps to drop to normal hahaha.

</div>

Edited by TurboMick

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Latest Posts

    • A few small updates since the previous post and lessons. I decided to do a little interior light upgrade on the 110. I quite like the iilumo items, even if they're a bit of a premium over other brands. You'll also note the Stedi Fogs, that will go into the S15 fog lights as I needed to match the bulbs since I got the new ones earlier. I hope they fit as the body is quite a bit longer than your normal bulb.  Annoyingly, I managed to trip the fuse, which normally wouldn't be an issue until I located the fuse. I can't say I've ever come across this. I had lucked out that someone nearby had a spare, but oddly enough Toyota dealerships seem to keep this in stock. I ordered some to keep in my stash and as luck would have it, someone else nearby tripped the same fuse so I passed on the favour.  I also did a little service on the 110 ahead of some additional work coming up. It's been annoying that Goleby's stopped carrying this particular HKS filter for the 110, so now I need to keep them on order from Japan. I also took the opportunity to install a bash plate and number plate riser. The plate riser is such a cheap but nice fix to help really tidy up the car. I'm tempted to now also replace my headlights, on this car. Both items were from Project Aero.    I also needed to replace the rear tyres on the 110, and after trying to get it aligned learnt that I need to replace some bushes in the front end, so that's next.  Closing out this update with a nicer picture as always! 
    • Yeah mate, never miss it.
    • Any going to watch World Time Attack at SMSP this year?
    • Appreciate the correction on the "ground", that will make a huge difference to looking at this. That makes complete sense about AF70/AF71 which is what I had come down to being the issue, one of these. I'll have another look in the ignition wiring when I get a chance next week. I'll also make up a jumper wire for running that AF73 test.  ECU is fine, relay itself is fine, pump harness is fine and the pump itself is fine. I am going to upgrade the Walbro 255 anyway with a DW300 I have since I need to replace the fuel sender and I'm going to upgrade the FPR with my chasebays kit ready for new plenum/injectors/dbw, but I'll get this working first. That's why this is so frustrating. 
×
×
  • Create New...